package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author Jqcc
 * @Version 1.0
 * @Data 2023/8/8
 */
@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;


    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        // 开始分页
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        long total = page.getTotal();
        List<DishVO> result = page.getResult();

        return new PageResult(total, result);
    }


    /**
     * 批量删除菜品
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteById(List<Long> ids) {

        // 判断当前菜品是否能够删除---是否存在起售中的菜品？
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 当前处于起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前菜品是否能够删除---是否被套餐关联？
        List<Long> setmealDishIds = setmealDishMapper.getSetmealDishIds(ids);
        if (setmealDishIds.size() > 0 && setmealDishIds != null) {
            // 当前菜品被套餐关联了
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的数据
        for (Long id : ids) {
            dishMapper.deleteById(id);
            // 删除菜品表关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    /**
     * 菜品起售、停售
     *
     * @param status
     * @param id
     */
    @Override
    public void dishStatus(Integer status, Long id) {
        dishMapper.dishStatus(status, id);
    }


    /**
     * 新增菜品和对应口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long id = dish.getId();

        // 向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(id);
            });
            // 批量插入数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据主键查询菜品和口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO selectByIdWithFlavor(Long id) {
        // 查询菜品数据
        Dish dish = dishMapper.selectById(id);
        // 查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getDishFlavorByDishId(id);
        // 封装对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品和口味
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        // 修改菜品表基本信息
        dishMapper.update(dish);
        Long id = dish.getId();

        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishId(id);

        // 重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors != null && flavors.size() > 0) {
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(id);
            }
            dishFlavorMapper.insertBatch(flavors);
        }

    }


    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }


    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getDishFlavorByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
